package com.hsj.springai.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

@Configuration
@EnableAsync   //开启异步
public class AsyncConfiguration {

    //自定义线程池
    @Bean("mailThreadPool")
    public Executor mailThreadPool() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        //核心线程数：线程池创建时候初始化的线程数
        executor.setCorePoolSize(10);
        //最大线程数：线程池最大的线程数，只有在缓冲队列满了之后才会中请超过核心线程数的线程
        executor.setMaxPoolSize(20);
        //缓冲队列：用来缓冲执行任务的队列
        executor.setQueueCapacity(500);
        //允许线程的空闲时间60秒：当超过了核心线程之外的线程在空闲时间到达之后会被销毁
        executor.setKeepAliveSeconds(60);
        //线程池名的前缀：设置好了之后可以方便我们定位处理任务所在的线程池
        executor.setThreadNamePrefix("mail-thread-pool");
        //缓冲队列满了之后的拒绝策略：由调用线程处理（一般是主线程）
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.DiscardOldestPolicy());
        executor.initialize();;
        return executor;
    }

}
